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Date: Tue, 20 May 2003 01:16:00 -0000
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To: gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org, lloyd@acm.jhu.edu,
  nobody@gcc.gnu.org
From: bangerth@dealii.org
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  lloyd@acm.jhu.edu, nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Subject: Re: optimization/10877: [3.3/3.4 regression] miscompilation with -O3 -fPIC on x86
X-SW-Source: 2003-05/txt/msg02135.txt.bz2
List-Id: <gcc-prs.sourceware.org>

Old Synopsis: GCC 3.3 miscompiles code with -O3 -fPIC on x86
New Synopsis: [3.3/3.4 regression] miscompilation with -O3 -fPIC on x86

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Tue May 20 01:16:37 2003
State-Changed-Why:
    Confirmed. This is a smaller snippet (it has nothing to
    do with namespaces):
    ----------------------------
    int* i;
    
    int& get_x() {
      return *i;
    }
    
    int main() {
      int j;
      i = &j;
      get_x();
    }
    --------------------------
    It crashed in get_x:
    
    g/x> /home/bangerth/bin/gcc-3.3-pre/bin/c++ -O3 -fPIC x.cc
    g/x> ./a.out
    Segmentation fault
    
    Note that we really need both -fPIC and -O3.
    
    This crashes with both 3.3 and present mainline. It
    doesn't with 2.95 and 3.2.3, so it's definitely a
    regression worth fixing!
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10877